<template>
    <div class="login_container">
        <div class="login_box">
            <!-- 头像区域 -->
            <div class="avatar_box">
              <img src="../assets/logo.png">
            </div>
        <!-- 登录表单区域 -->
        <el-form
       ref="loginFormRef" :model="loginForm" :rules="loginFormRules" label-width="0px" class="login_form">
            <!--用户名  -->
  <el-form-item prop="username" >
    <el-input v-model="loginForm.username" prefix-icon="iconfont icon-user"
></el-input>
  </el-form-item>
  <!-- 密码 -->
  <el-form-item prop="password">
    <el-input v-model="loginForm.password" prefix-icon="iconfont icon-3702mima"
 type="password"></el-input>
  </el-form-item>
  <!-- 按钮区域 -->
  <el-form-item class="btns">
    <el-button type="primary" @click="login">登录</el-button>
    <el-button type="info" @click="resetLoginForm">重置</el-button>
  </el-form-item>
        </el-form>
        </div>
    </div>
</template>

<script>
export default {
  data () {
    return {
      // 这是登录表单的数据绑定对象
      loginForm: {
        username: '',
        password: ''
      },

      // 这是表单的验证规则对象
      loginFormRules: {
        // 验证用户名是否合法
        username: [
          { required: true, message: '请输入登录名称', trigger: 'blur' },
          { min: 3, max: 10, message: '长度在 3 到 10 个字符', trigger: 'blur' }

        ],
        // 验证密码是否合法
        password: [
          { required: true, message: '请输入登录密码', trigger: 'blur' },
          { min: 6, max: 15, message: '长度在 3 到 10 个字符', trigger: 'blur' }
        ]
      }
    }
  },
  methods: {
    resetLoginForm () {
      this.$refs.loginFormRef.resetFields()
    },
    login () {
      this.$refs.loginFormRef.validate(async valid => {
        if (!valid) return
        const { data: res } = await this.$http.post('login', this.loginForm)
        if (res.meta.status !== 200) return this.$message.error('登录失败')
        this.$message.success('登录成功！')
        /**
         * 1.将登录成功的token，保存到客户端的sessionstorage中
         * 1.1将项目中除了登录之外的其他api接口必须在登录之后才能访问
         * 1.2token只应在当前网站打开期间生效，所以将token保存在sessionstorage中
         *
         */
        window.sessionStorage.setItem('token', res.data.token)
        /**
         * 2.通过编程式导航跳转到后台主页，路由地址是/home
         *
         */
        this.$router.push('/home')
      })
    }

  }
}

</script>

<style lang="less" scoped>
    .login_container{
        background-color: #2b4b6b;
        height: 100%;
        }
    .login_box{
            width: 450px;
            height: 300px;
            background-color: #fff;
            border-radius: 3px;
            position: absolute;
            left:50%;
            top:50%;
            transform: translate(-50%,-50%);
        }
        .avatar_box{
            height: 130px;
            width: 130px;
            border:1px solid #eee;
            border-radius: 50%;
            padding: 10px;
            box-shadow: 0 0 10px #ddd;
            position: absolute;
            left:50%;
            transform: translate(-50%,-50%);
            background-color: #fff;
            img{
                width: 100%;
                height: 100%;
                border-radius: 50%;
                background-color: #eee;
            }

        }
        .btns{
            display: flex;
            justify-content: flex-end;
        }
        .login_form{
            position: absolute;
            bottom: 0;
            width: 100%;
            padding: 0 20px;
            box-sizing: border-box;
        }
</style>
